body {
  background: #f8f9fb;
  font-family: system-ui;
}

.header {
  padding: 5px;
  color: rgba(255, 255, 255, .7);
  background-color: #24292e;
  text-align: center;
}

.section {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.section:nth-of-type(2n) {
  background-color: #fff;
}
